package com.csdj.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.csdj.reggie.commcn.BaseContext;
import com.csdj.reggie.commcn.R;
import com.csdj.reggie.entity.ShoppingCart;
import com.csdj.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加菜品/套餐到购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据：{}",shoppingCart);
        // 设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);


        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        // 查询当前菜品或套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        if (dishId!=null){
            // 添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            // 添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart one = shoppingCartService.getOne(queryWrapper);

        if (one!=null){
            // 如果已存在，就在原来的基础上加1
            Integer number=one.getNumber();
            one.setNumber(number+1);
            shoppingCartService.updateById(one);
        }else {
            // 如果不存在。则添加到购物车，数量默认1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            one=shoppingCart;
        }

        return R.success(one);
    }

    /**
     * 查询购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车......");
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 减菜品/套餐
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车减少数据：{}",shoppingCart);
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        if(dishId != null){
            // 此时为dish 需判断数量， 为1 直接删除
            lambdaQueryWrapper.eq(ShoppingCart::getDishId,dishId);
            lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
            ShoppingCart one = shoppingCartService.getOne(lambdaQueryWrapper);
            Integer number = one.getNumber();
            if(number > 1){
                one.setNumber(number-1);
                shoppingCartService.updateById(one);
            }
            else{
                one.setNumber(number-1);
                shoppingCartService.updateById(one);
                shoppingCartService.remove(lambdaQueryWrapper);
            }
            return R.success(one);
        }else {
            lambdaQueryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
            lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
            ShoppingCart one = shoppingCartService.getOne(lambdaQueryWrapper);
            Integer number = one.getNumber();
            if (number>1){
                one.setNumber(number-1);
                shoppingCartService.updateById(one);
            }else {
                one.setNumber(number-1);
                shoppingCartService.updateById(one);
                shoppingCartService.remove(lambdaQueryWrapper);
            }
            return R.success(one);
        }
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
}
